This happens with UDP sockets. All you need to do is change socket operating mode before binding it. Use this code in your Start method.
If you remove or comment out the call to Close on the UdpClient then the program works as expected. Why this is happening I'm not sure, but it could be to do with the Windows loopback networking.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.